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A092283
Triangular array read by rows: T(n,k)=n+k^2, 1<=k<=n.
1
2, 3, 6, 4, 7, 12, 5, 8, 13, 20, 6, 9, 14, 21, 30, 7, 10, 15, 22, 31, 42, 8, 11, 16, 23, 32, 43, 56, 9, 12, 17, 24, 33, 44, 57, 72, 10, 13, 18, 25, 34, 45, 58, 73, 90, 11, 14, 19, 26, 35, 46, 59, 74, 91, 110, 12, 15, 20, 27, 36, 47, 60, 75, 92, 111, 132, 13, 16, 21, 28, 37
OFFSET
1,1
COMMENTS
T(n,n) = A002378(n+1);
Sum(T(n,k):1<=k<=n) = A000330(n) + A000290(n).
LINKS
EXAMPLE
2 ;
3 6 ;
4 7 12 ;
5 8 13 20;
6 9 14 21 30;
7 10 15 22 31 42 ;
8 11 16 23 32 43 56 ;
9 12 17 24 33 44 57 72 ;
10 13 18 25 34 45 58 73 90 ;
11 14 19 26 35 46 59 74 91 110 ;
MATHEMATICA
Table[n+k^2, {n, 20}, {k, n}]//Flatten (* Harvey P. Dale, Jun 24 2017 *)
CROSSREFS
Cf. A101986 (row sums).
Sequence in context: A098286 A226615 A138608 * A266191 A273338 A099900
KEYWORD
nonn,easy,tabl
AUTHOR
Reinhard Zumkeller, Jan 27 2004
STATUS
approved